DEIM Forum 2012 C6-4 DB EV (EV) EV GPS EV EV

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1 DEIM Forum 2012 C6-4 DB EV {fueda-naoki-yd,hagimoto-shintaro-tw,deguchi-toru-mk,tommy}@ynu.ac.jp (EV) EV GPS EV EV V2X(Vehicle to X),,, GPS,,, V2X Construction of Driving Log Database and Estimation Method of Energy Consumption for Electric Vehicles Naoki FUEDA, Shintaro HAGIMOTO, Toru DEGUCHI, and Takashi TOMII Department of Information Media and Environment Sciences, Graduate School of Environment and Information Sciences, Yokohama National University Faculty of Environment and Infomation Sciences, Yokohama National University 79 7 Tokiwadai, Hodogaya-ku, Yokohama, Japan {fueda-naoki-yd,hagimoto-shintaro-tw,deguchi-toru-mk,tommy}@ynu.ac.jp Abstract EV(Electric Vehicle) is considered as a new environmentally-compatible mobility because of high energy conversion efficiency and Zero-CO2 emissions. In this paper, we propose a design method of database in which accumulated data from GPS and accelerator sensor are stored. In addition, an estimation method of energy consumption for EV using that data is also proposed. Drivers are able to look back at own drivings by using the database searched by individuals, places or any conditions. In terms of V2X, a system in which EV communicate with the power grid, the buildings and houses to sell demand response services by either delivering electricity, we can manage electric energy by using this database. As for the result, we implemented prototype of the system, and also evaluated the effectiveness of it. Key words Electric Vehicle, Sensor Database, Estimation of Electric Energy, GPS, Acceleration Sensor, Logs from Driving, V2X [1]

2 (Electric Vehicle : EV) EV EV V2X(Vehicle to X) EV V2X V2X EV 1 EV EV EV EV EV V2X EV GPS [2] EV EV V2X EV 1 V2X EV V2X (Electric Vehicle : EV) LEAF 24kWh 200km [3] EV [4] EV 1 EV Grid:V2G Home:V2H Building:V2B V2X(Vehicle to X) ( 1) [5] [7]EV EV V2X EV 2. 2 IC GPS

3 GPS GPS [8] [9] 3. EV V2X EV EV EV EV EV GPS V2X 3. 1 ECOLOG 2 GPS GPS 2 ECOLOG GPS ID ID ECOLOG(Energy COnsumption LOG) ECOLOG ECOLOG EV EV V2X GPS

4 4 3 1Hz V2X EV GPS ECOLOG GPS V2X [10] R AIR R ROLL R SLOP E R ACC F d [N] (1) F d = R AIR + R ROLL + R SLOP E + R ACC = 1 2 ρc dav 2 + µmg cos θ + Mg sin θ + M(a + g sin θ) (1) (1) 1 GPS ρ µ 1 1 ρ kg/m 3 C d (CD ) A m 2 v m/s GPS µ M kg g m/s 2 θ rad a m/s 2 F d R ACC = Ma 5 A x A x = a + g sin θ R ACC = M(a + g sin θ) F d t P e (t)[w ] t start t end E e [kw h] P d (t)[w ] P d (t) = F d (t) v(t) η [rpm] [Nm] ( 6) EV η [11] P e P d (t) 0( ) P e (t) η = P d (t) P d (t) 0( ) P e (t) = P d (t) η E e E e = c t end t start P e (t)dt c[w h/j] 1Hz E e = c t end t=t start P e (t) 3. 4 EV 7 9 EV a(> 0)

5 5 7 ( ) (a = 0) (a < 0) a [11] ( ) 9 ( ) EV (1) GPS EV GPS

6 図 10 データベーススキーマ 正規化サンプリングレートにリサンプルした GPS や加速度セ 図 11 ECOLOG テーブル ンサの値 またそれらから推定を行った消費電力量を一つの テーブルとしてまとめた ECOLOG テーブル (図 11) である 表 2 車載 GPS の詳細データ これは 1Hz でリサンプルされたデータを蓄積しているので 消 機器名 Transystem 社製 747Pro 費電力量を単純な総和として算出することができる 黄色の部 位置精度 3.0m 2D-RMS 分には車両や運転者の情報などのデータ 橙の部分には道路情 速度精度 0.1m/s 報や標高などの検索の集約単位として使用する外部データを保 サンプリングレート 最大 5Hz 持するテーブルとした 最大ログレコード数 25 万件 今回構築したこのデータベースでは ECOLOG テーブルに 対して選択 集約 演算処理をするだけで様々な情報を高速に 表3 車載加速度センサの詳細データ 機器名 ATR-Promotions 社製小型無線 検索することができるよう設計した 例えば 自分の運転軌跡 ハイブリッドセンサ 上のデータを集計し 今回のエネルギー消費と今までの平均を 加速度感度 ± 2G 比較することや 普段から多くエネルギーを消費する地点を検 加速度分解能 4mG 索することで運転の改善に繋がる また 事業所に集まる電気 サンプリングレート 最大 1000Hz 自動車において 行きでの消費電力量や過去のデータからどの 最大ログレコード数 約 7 千万件 (WAA-010) 程度の電力が事業所で使用できるのかを概算することが可能と なる これらの検索演算は全て SQL 文によって記述可能であり か つ データベース管理システムによる検索最適化が適用される ため データが多くなった場合にもある程度の現実的な時間で 検索可能である 4. 実 験 以上の消費エネルギー推定手法とデータベースの実現性の検 証のため 実際に被験車両に GPS と加速度センサを搭載し 走行データを取得した 取得したデータをもとに消費電力推定 を行い データベースに蓄積した 蓄積された情報から V2X を行った際にどの程度の効果が得られるのかの検証を行った 図 12 GPS 加速度センサの設置 4. 1 搭載センサ 今回の実験では被験車両のダッシュボードに表 2 3 に示さ 検証した 被験車両は日産の LEAF を用いた 日産の LEAF れるセンサを図 12 のように設置した これらのセンサはそれ はカーナビの画面に図 13 のように瞬間消費電力量を表示する ぞれ 内蔵フラッシュメモリにログを記録するように設定し ことができる その様子を車内に取り付けたカメラで動画撮影 通勤中の走行ログを記録した し 後に目視で数値を読み取り その値と GPS や加速度デー 4. 2 実際の EV を用いた消費電力推定の精度実験 まず 3. 3 節で推定した消費電力量がどの程度正しいのかを タから推定した消費電力量との比較を行った

7 図 15 消費電力可視化 表 4 10 月の日別往復別消費電力量 図 13 リーフモニタ撮影の様子 図 14 リーフモニタデータと推測値の比較 表 5 近傍 2 か月の平均 最大 最小消費電力量 実験結果を図 14 に示す 図 14 における赤線がリーフのモニ タから読み取った値を示し 青線が推測値を示す 推測値はセ ンサからの値なので多少のばらつきは見られるものの おおよ その形状は合致している この結果から推測は有効であること がわかった 4. 3 データ取得実験 4. 5 V2X 導入効果の検討 表 4 は 2011 年 10 月の消費電力量を日別 往復別に表した 続いて 消費電力推定や V2X への効果検証のために長期的 もの 表 5 は該当期間における使用電力量の平均 最大 最 なデータ取得実験を行った この実験では 被験車両は電気自 小を表したものである ここでの残余とはバッテリー充電量を 動車ではなく ガソリン車を使用した 2011 年 7 月 12 日 12kWh 注 2 とした場合の余剰電力量を表している つまりこ 2012 年 2 月 26 日の期間で被験者 1 名 被験車両 1 台による通 の値が V2X によって勤務先に提供可能な電力量と考えられる 勤データ往路 106 件 復路 107 件が取得できた この表から 4.1 ± 1.3kW h が提供可能な電力と見込まれる 4. 4 地図上への消費電力可視化 5. まとめと今後の課題 図 15 は ある日のトリップにおける消費電力を地図上に表 示したものである 図 15 の赤い線が今回のトリップのデータ 本稿では EV に搭載した GPS や加速度センサなどの簡易 青い線が平均データ 緑色の線が平均に標準偏差を足し引きし なセンサから得たデータを蓄積するデータベースの構築手法と た値を示す これを見ることにより その日のトリップにおい 共に そのデータを用いた EV の消費電力推定手法について述 て統計的に見て平均より多くの電力を使っているような場所や 毎日平均して多く電力を使っている場所などを直感的に把握す ることができる 注 2 日産の LEAF は 24kWh のバッテリーを搭載している 出発前の充電 量を 80% とし 通勤往復が終了した時点での残すべき最低残量を 30% とする と 1 日の往復トリップで使用可能な電力量は = 50% である ここか ら 24kWh の 50% である 12kWh を 1 日で使用可能な電力量とした

8 V2X [1] 2011, [2],,,, V2G, 10 ITS [3] LEAF Web, [4],, HEV, PHEV CO2, Vol.40, No.4, pp , [5] W. Kempton, J. Tomic, Vehicle-to-grid power fundamentals:calculating capacity and net revenue, Journal of Power Sources, Vol.144, Issue.1,pp , [6] W. Kempton, J. Tomic, Vehicle-to-grid power implementation: From stabilizing the grid to supporting large-scale renewable energy, Journal of Power Sources 144, pp , [7] S. Kamboj, W. Kempton, K. S. Decker, Deploying power grid-integrated electric vehicles as a multi-agent system, Proc. of the 10th Int l Joint Conf.on Autonomous Agents and Multiagent Systems (AAMAS 2011), pp.13-20, [8],, 9 ITS [9],,, RFID CONSENT,,Vol.8, No.1, pp.41-46, [10],,,, [11],,,,,,,, 2010.

1. 4 1 9 [1] (Electric Vehicle : EV) EV EV EV EV LEAF [2] 24kWh 228km EV V2X(Vehicle to X) EV V2X V2X EV 1 EV EV EV EV EV V2X V2X GPS EV EV EV EV V2X

1. 4 1 9 [1] (Electric Vehicle : EV) EV EV EV EV LEAF [2] 24kWh 228km EV V2X(Vehicle to X) EV V2X V2X EV 1 EV EV EV EV EV V2X V2X GPS EV EV EV EV V2X DEIM Forum 2013 E2-1 EV DB V2X 240 8501 79 7 240 8501 79 7 240 8501 79 7 E-mail: {fueda-naoki-yd,hagimoto-shintaro-tw,hayashi-takuya-hb,sanui-ryo-xn,tommy}@ynu.ac.jp GPS (EV) EV V2X(Vehicle to X) EV EV

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